Relative Permeance-Based Airgap Flux Density Analysis of SPMSM Considering Slotting Effect and Tooth-Tip Flux Concentration

초록

This paper addresses the limitation of conventional relative permeance-based models in analyzing the slotting effect of surface-mounted permanent magnet synchronous motors (SPMSMs). Traditional models often fail to adequately capture the flux concentration at the tooth tips, resulting in significant errors. To overcome this issue, a modified relative permeance model is proposed, incorporating slot geometry effects through conformal mapping and introducing a tooth-tip flux concentration term formulated using a cosine window function. Comparative analysis with existing models shows that the proposed model reduces estimation errors of the airgap flux density distribution by up to 52% under no-load conditions and up to 71% under loaded conditions, achieving substantially improved accuracy. These results confirm that the proposed analytical approach enhances the reliability of airgap flux density prediction, particularly useful in the early stages of SPMSM design.

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